Buggy code:
@ Override public boolean isIndependent ( ) { } public boolean isChangeable ( ) { } public boolean isPointOnPath ( ) { } public boolean isRedefineable ( ) { } public boolean isMoveable ( ) { } public boolean isMoveable ( EuclidianViewInterfaceSlim view ) { } public boolean hasMoveableInputPoints ( EuclidianViewInterfaceSlim view ) { } public ArrayList < GeoPoint2 > getFreeInputPoints ( EuclidianViewInterfaceSlim view ) { } public final boolean hasOnlyFreeInputPoints ( EuclidianViewInterfaceSlim view ) { } private static boolean containsOnlyMoveableGeos ( ArrayList < GeoPoint2 > geos ) { } public boolean isTranslateable ( ) { } public boolean isRotateMoveable ( ) { } public boolean hasProperties ( ) { } public void setAnimationStep ( double s ) { } public void setAnimationStep ( NumberValue v ) { } public double getAnimationStep ( ) { } public GeoElement getAnimationStepObject ( ) { } public GeoElement getAnimationSpeedObject ( ) { } public double getAnimationSpeed ( ) { } public void setAnimationSpeedObject ( NumberValue speed ) { } public void setAnimationSpeed ( double speed ) { } private void initAnimationSpeedObject ( ) { } public final int getAnimationType ( ) { } public final void setAnimationType ( int type ) { } protected int getAnimationDirection ( ) { } protected void changeAnimationDirection ( ) { } public synchronized void setAnimating ( boolean flag ) { } public final boolean isAnimating ( ) { } public boolean isAnimatable ( ) { } public String toLaTeXString ( boolean symbolic ) { } public String toCasAssignment ( StringType type ) { } public String getAssignmentLHS ( ) { } public String getCASString ( boolean symbolic ) { } public void addCellRangeUser ( ) { } public void removeCellRangeUser ( ) { } public boolean isRenameable ( ) { } public void addCasAlgoUser ( ) { } public void removeCasAlgoUser ( ) { } public void unbindVariableInCAS ( ) { } public boolean isSendingUpdatesToCAS ( ) { } public boolean rename ( String newLabel ) { } public boolean isLabelSet ( ) { } public void setLabel ( String newLabel ) { } public void setLoadedLabel ( String label ) { } public boolean setCaption ( String caption ) { } StringBuilder captionSB = null ; public String getCaptionNoReplace ( ) { } public String getCaption ( ) { } public String getRawCaption ( ) { } public String getCaptionDescription ( ) { } public void setLocalVariableLabel ( String label ) { } public void undoLocalVariableLabel ( ) { } public boolean isLocalVariable ( ) { } private void doSetLabel ( String label ) { } private void updateSpreadsheetCoordinates ( ) { } public String getSpreadsheetLabelWithDollars ( boolean col$ , boolean row$ ) { } public static final int compareLabels ( String label1 , String label2 , GeoElementSpreadsheet geoElementSpreadsheet ) { } public static final int MAX_LINE_WIDTH = 13 ; private void doRenameLabel ( String newLabel ) { } public final String getOldLabel ( ) { } public static void setLabels ( String labelPrefix , GeoElement [ ] geos , GeoElementSpreadsheet geoElementSpreadsheet ) { } public static void setLabels ( String [ ] labels , GeoElement [ ] geos , GeoElementSpreadsheet geoElementSpreadsheet ) { } static void setLabels ( String [ ] labels , GeoElement [ ] geos , boolean indexedOnly , GeoElementSpreadsheet geoElementSpreadsheet ) { } public String getFreeLabel ( String suggestedLabel ) { } public String getDefaultLabel ( boolean isInteger ) { } public String getDefaultLabel ( ) { } protected String getDefaultLabel ( char [ ] chars , boolean isInteger ) { } private String defaultNumberedLabel ( String plainKey ) { } public String getIndexLabel ( String prefix ) { } public boolean isGeoTextField ( ) { } @ Override public void remove ( ) { } public void doRemove ( ) { } LaTeXCache latexCache = null ; public LaTeXCache getLaTeXCache ( ) { if ( ( latexCache ) == null ) { <START_BUG> prototype . newLaTeXCache ( ) ; <END_BUG> } return latexCache ; } @ Override public final void notifyAdd ( ) { } @ Override public final void notifyRemove ( ) { } public final void notifyUpdate ( ) { } public final void notifyUpdateAuxiliaryObject ( ) { } public final void addAlgorithm ( AlgoElement algorithm ) { } public final void addToAlgorithmListOnly ( AlgoElement algorithm ) { } public final void addToUpdateSetOnly ( AlgoElement algorithm ) { } public final void removeAlgorithm ( AlgoElementInterface algorithm ) { } public AlgorithmSet getAlgoUpdateSet ( ) { } public void addToUpdateSets ( AlgoElement algorithm ) { } public void removeFromUpdateSets ( AlgoElement algorithm ) { } @ Override public void update ( ) { } private final void updateGeo ( ) { } public final boolean sendValueToCAS ( ) { } private void algebraStringsNeedUpdate ( ) { } public void updateCascade ( ) { } private final void updateDependentObjects ( ) { } protected void updateAlgoUpdateSetWith ( GeoElement secondGeo ) { } public static final synchronized void updateCascade ( ArrayList < ? > geos , TreeSet < AlgoElementInterface > tempSet , boolean updateCascadeAll ) { } public static final void updateCascadeUntil ( ArrayList < ? > geos , TreeSet < AlgoElementInterface > tempSet , AlgoElement lastAlgo ) { } public final void updateRepaint ( ) { } public void updateVisualStyle ( ) { } public void updateVisualStyleRepaint ( ) { } @ Override public String toString ( ) { } public String toRealString ( ) { } public boolean isConstant ( ) { } public boolean isLeaf ( ) { } public ExpressionValue evaluate ( ) { } public HashSet < GeoElement > getVariables ( ) { } public ArrayList < GeoNumeric > getRandomNumberPredecessorsWithoutLabels ( ) { } public TreeSet < GeoElement > getAllPredecessors ( ) { } @ Override public TreeSet < GeoElement > getAllIndependentPredecessors ( ) { } public final void addPredecessorsToSet ( TreeSet < GeoElement > set , boolean onlyIndependent ) { } public TreeSet < GeoElement > getAllRandomizablePredecessors ( ) { }

Fix:
latexCache = prototype . newLaTeXCache ( ) ;